Talk to Judd after battling for a while, and he might give you a Super Sea Snail! In the original Splatoon, he’d award one for every 30 wins, but these days he’s a little more stingy. Now, he’ll only give one out for every 30 levels instead. If there’s a Splatfest going on, you can also earn them by participating. Hand them over to Murch and he can increase or re-roll your ability slots. Just don’t ask what he does with them.